Duplex hitch



FIG. 1 is a side elevation view of a duplex hitch showing my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a perspective view thereof in opened condition. 

The ornamental design for a duplex hitch, as shown. 